MiniGRAIL progress report 2004


Waard, A. de and Benzaim, Y. and Frossati, G. and Gottardi, L. and Mark, H. van der and Flokstra, J. and Podt, M. and Bassan, M. and Minenkov, Y. and Moleti, A. and Rocchi, A. and Fafone, V. and Pallottino, G.V. (2004) MiniGRAIL progress report 2004. Classical and Quantum Gravity, 22 (10). S215-S219. ISSN 0264-9381

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Abstract:The MiniGRAIL detector was improved. The sphere was replaced by a slightly larger one, having a diameter of 68 cm (instead of 65 cm), reducing the resonant frequency by about 200 Hz to around 2.9 kHz. The last four masses of the attenuation system were machined to increase their resonant frequency and improve the attenuation around the resonant frequency of the sphere. In the new sphere, six holes were machined on the TIGA positions for easy mounting of the transducers. During the last cryogenic run, two capacitive transducers and a calibrator were mounted on the sphere. The first transducer was coupled to a double-stage SQUID amplifier having a commercial quantum design SQUID as a first stage and a DROS as a second stage. The second transducer was read by a single-stage quantum design SQUID. During the cryogenic run, the sphere was cooled down to 4 K. The two-stage SQUID had a flux noise of about 1.6 μ0 Hz−1/2. The detector was calibrated and the sensitivity curve of MiniGRAIL was determined.
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Copyright:© 2004 Institute of Physics
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